Drillers area attack

[atlatea]

I still don't know how to kill Baal and Kthul with no losses but everything else was not very difficult (mage impossible)

Againts k'tahu, just make him rarely/never use his mass attack, and you'll get easy no loss win. By the way, to do that, position your unit in front of his iron claw attack area, though 1 stack won't 100% guarantee no mass attack, but 2 stacks will 100 % guarantee it, and to make it more guaranteed, have 1 attacker always on the blind spot attack (hexagon which is in front of his normal claw). Summoning unit might be the best option to do this (since you don't want your real stacks to get hit by k'tahu insane physical dmg)

Imo Baal is easier than k'tahu (weaker mass attack) and you have bill gilbert.